A monitoring device for a gas density relay

Abstract

The application discloses a monitoring device for a gas density relay, comprising a signal acquisition intelligent control unit and a pressure regulating mechanism, wherein the pressure regulating mechanism comprises a shell, a pressure boosting device and a plugging mechanism; the shell constitutes a sealed cavity, which is arranged on a pipeline between a to-be-measured gas density relay and an electrical equipment; an air inlet end of the pressure boosting device is communicated with the sealed cavity, and an air outlet end of the pressure boosting device is communicated with an inner cavity of the plugging mechanism through a connecting pipeline; an elastic sealing element and an exhaust mechanism are arranged on the plugging mechanism, and one end of the plugging mechanism selectively closes or opens the connecting pipeline between the sealed cavity and the electrical equipment through the elastic sealing element; the signal acquisition intelligent control unit is communicated with the sealed cavity, and is used for realizing data acquisition of gas pressure and temperature in the sealed cavity, and completing control of each functional component in the pressure regulating mechanism; and the signal acquisition intelligent control unit is connected with the to-be-measured gas density relay, and data acquisition of a contact state in the gas density relay is completed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric power, and relates to a gas density monitoring device of a density relay, in particular to an intelligent gas density monitoring device applied to an existing substation for upgrading and reconstruction of a density relay. BACKGROUND

[0002] With the continuous development of smart grid, smart high-voltage electrical equipment, as an important part and key node of the smart substation, plays a decisive role in the safety of the smart grid. Most of the high-voltage electrical equipment is currently SF6 gas insulated equipment, and if the gas density is reduced (such as caused by leakage), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to the safe operation. Therefore, regular inspection of the SF6 gas density relay on the SF6 electrical equipment is a necessary measure to ensure the safe and reliable operation of the SF6 electrical equipment.

[0003] At present, the calibration of SF6 gas density relays has been very important and popular in the power system, and each power supply company, power plant and large factory and mine enterprise has implemented it. In order to complete the on-site calibration and detection of the density relay, the power supply company, power plant and large factory and mine enterprise need to be equipped with test personnel, equipment vehicles and high-value SF6 gas. Including the loss of power outage business during detection, rough calculation shows that the detection cost of each high-voltage switch station is tens of thousands to hundreds of thousands of yuan per year; in addition, if the detection personnel do not operate in a standard manner, there are safety hazards.

[0004] Therefore, it is very important to automatically calibrate the gas density relay of the existing substation (i.e. the existing substation) and complete the online monitoring of the gas density, that is, how to provide a self-calibration intelligent gas density monitoring device for the existing substation has become a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0005] The purpose of the present application is to overcome the problems of the prior art, and a monitoring device of a gas density relay is disclosed, which realizes online calibration of the gas density relay while ensuring that the gas in the gas density relay does not leak, thereby ensuring the safe operation of the power grid.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] The utility model provides a kind of monitoring device of gas density relay, the monitoring device includes: signal acquisition intelligent control unit and pressure regulating mechanism, wherein the pressure regulating mechanism includes shell, booster equipment and plugging mechanism;The shell constitutes sealed cavity, the booster equipment, plugging mechanism are located in the sealed cavity, and the sealed cavity is arranged on the pipeline between the gas density relay to be measured and electrical equipment;The air inlet end of the booster equipment is communicated with the sealed cavity, and the air outlet end of the booster equipment is communicated with the inner chamber of the plugging mechanism through connecting pipeline;Elastic sealing element and exhaust mechanism are provided on the plugging mechanism, one end of the plugging mechanism is fixed on the shell, and the other end is selected to close or open the connecting pipeline between the sealed cavity and electrical equipment through elastic sealing element;The signal acquisition intelligent control unit is communicated with the sealed cavity, for realizing the gas pressure, temperature data acquisition in the sealed cavity, and completing the control of each functional component in the pressure regulating mechanism;And the signal acquisition intelligent control unit is connected with the gas density relay to be measured, and the contact state data acquisition in the gas density relay is completed.

[0008] According to a preferred embodiment, the pressure regulating mechanism further comprises an elastic element, which causes the elastic sealing element to have a tendency to open the connecting pipeline between the sealed cavity and the electrical equipment.

[0009] According to a preferred embodiment, a flow control valve and a check valve are provided in sequence on the connecting pipeline from the booster equipment to the plugging mechanism.

[0010] According to a preferred embodiment, a sensor is further provided on the plugging mechanism.

[0011] According to a preferred embodiment, the plugging mechanism is a corrugated spring mechanism.

[0012] According to a preferred embodiment, the detection device further comprises a multi-way connector, and the gas density relay and the signal acquisition intelligent control unit are respectively communicated with the sealed cavity through the inner pipeline of the multi-way connector.

[0013] According to a preferred embodiment, the electrical equipment is communicated with the sealed cavity through the inner pipeline of the multi-way connector.

[0014] According to a preferred embodiment, the shell is fixed on the side wall of the multi-way connector through a fixing member, and a sealing element is provided between the shell and the side wall of the multi-way connector.

[0015] According to a preferred embodiment, a pressure sensor and a temperature sensor are provided in the signal acquisition intelligent control unit.

[0016] According to a preferred embodiment, the signal acquisition intelligent control unit is connected with the gas density relay through a signal line.

[0017] The foregoing main scheme of the present application and each further selected scheme thereof can be freely combined to form multiple schemes, all of which are the schemes that can be adopted and claimed by the present application. Those skilled in the art can understand that there are multiple combinations according to the prior art and common knowledge after understanding the schemes of the present application, all of which are the technical schemes claimed by the present application, and here is not exhaustive.

[0018] Advantages of the present application:

[0019] Through the structural design of the monitoring device of the gas density relay, when online verification is performed, the device can be started by the background or control unit. After the pressure regulating mechanism starts the pressurizing device, the gas is compressed to the plugging mechanism, so that the plugging mechanism moves to cut off the electrical equipment and the gas circuit connection of the gas density relay. The pressurizing device continues to compress the gas to the spring bellows mechanism, so that the pressure at the end of the gas density relay drops to the contact action value to complete the downstroke verification. After that, the pressurizing device stops working. The exhaust mechanism on the plugging mechanism exhausts the gas to the outside of the plugging mechanism, so that the pressure at the end of the gas density relay rises to the contact value to complete the upstroke verification. After that, the plugging mechanism continues to exhaust the gas to the outside of the bellows until the pressure in the inner cavity of the plugging mechanism and the gas pressure in the sealed cavity are balanced. The plugging mechanism is automatically opened by the spring mechanism, so that the gas circuit of the density relay body returns to the device, that is, the electrical equipment and the gas circuit of the gas density relay body are connected again. The benefits of the device mainly include: the entire verification process is completed in a sealed cavity, the gas pressure rises and falls, and SF6 gas leakage to the atmospheric environment does not occur, so that the density relay can be verified online without leakage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a monitoring device of a gas density relay in an embodiment of the present application;

[0021] Figure 2 is an electrical principle schematic diagram of the monitoring device of the gas density relay in the embodiment of the present application;

[0022] Figure 3 is a working state structure schematic diagram of the pressure regulating mechanism of embodiment 3 in the self-verification intelligent gas density monitoring device;

[0023] Figure 4 is a state structure schematic diagram of the pressure regulating mechanism of embodiment 3 in the self-verification intelligent gas density monitoring device after the gas density relay is turned off;

[0024] Figure 5 is a positive stroke verification state structure schematic diagram of the pressure regulating mechanism of embodiment 3 in the self-verification intelligent gas density monitoring device;

[0025] Figure 6is a structure schematic diagram of the over-travel check opening gas density relay gas circuit state of the self-checking intelligent gas density monitoring device of the pressure regulating mechanism of Example 3;

[0026] Wherein, 1-gas density relay, 2-signal line, 3-signal acquisition intelligent control unit, 4-pressure regulating mechanism, 401-housing, 402-sealing element, 403-fixing part, 404-pressurizing device, 4041-connection pipeline, 4042-flow control valve, 4043-check valve, 405-blocking mechanism, 405A-elastic sealing element, 406-exhaust mechanism, 407-sensor, 408-elastic element, 409-sealing cavity, 5-multi-way joint, 6-electrical equipment. DETAILED DESCRIPTION

[0027] The present application is further explained in the detailed description set forth below. In the description, all temperatures are in degrees Celsius (°C) unless otherwise indicated. All concentrations are in weight percent (wt%) unless otherwise indicated. Other advantages and / or features of the present application will be apparent from the detailed description set forth below. It should be appreciated that those aspects of the embodiments that can vary are contemplated as within the scope of the present application. Various embodiments of the application are disclosed herein, and for the avoidance of doubt, the appended claims are meant to cover all methods, of both those currently known or used, and those developed after the time of the patent, including permutations and combinations of those attributes recited currently as well as future equivalents. Additionally, specific details of certain methods, devices, and materials are set forth in this disclosure to provide a thorough understanding of the present application. However, it will be understood by those skilled in the art that the present application can be practiced without resorting to the details specifically set forth herein. In other instances, well known methods, devices, and materials have not been described in detail in order to avoid obscuring aspects of the present application.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed during use, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In addition, the present application points out that, in the present application, if a specific structure, connection relationship, position relationship, power source relationship, etc. is not particularly written, the structure, connection relationship, position relationship, power source relationship, etc. involved in the present application can be known by those skilled in the art without creative labor on the basis of the prior art.

[0031] Embodiment 1

[0032] Reference Figure 1 , 2 As shown in the figure, the embodiment discloses a monitoring device of a gas density relay, which comprises a signal acquisition intelligent control unit 3 and a pressure regulating mechanism 4.

[0033] The pressure regulating mechanism 4 is arranged on a pipeline between the gas density relay 1 to be measured and an electrical equipment 6, and is used to cut off the connection between the electrical equipment 6 and the gas circuit of the gas density relay 1 during calibration. The pressure regulating mechanism 4 is also used to increase or decrease the gas pressure during calibration of the gas density relay 1, and is used together with the signal acquisition intelligent control unit 3 to achieve the purpose of calibrating each contact (alarm and / or locking contact) of the gas density relay 1.

[0034] The signal acquisition intelligent control unit 3 comprises a pressure sensor, a temperature sensor and / or a gas density sensor, which are used to acquire the pressure, temperature and / or density signals in the gas passage. The signal acquisition intelligent control unit 3 further comprises two functions: one is to monitor the gas density, temperature and pressure parameters of the electrical equipment 6 online in a non-calibration state (when the gas density relay 1 is normally working), and to transmit the related data to the background; the other is to control the signal on-off or switching between the contacts of the gas density relay 1 and the monitoring loop (background) of the density relay, and to control the pressure regulating mechanism 4 to cut off the connection between the electrical equipment 6 and the gas circuit of the density relay body 1, and to increase or decrease the gas pressure of the density relay body 1, and to complete the online calibration of the density relay according to the software algorithm of the control unit in the signal acquisition intelligent control unit 3. The signal acquisition intelligent control unit 3 is connected with the gas density relay 1 through a signal line 2.

[0035] From Figure 2 It can be known that, in the embodiment, the signal acquisition intelligent control unit 3 controls the signal on-off or switching between the contacts of the gas density relay 1 and the monitoring loop of the density relay through the intermediate relay K1. Specifically, when the gas density relay 1 is calibrated, the signal acquisition intelligent control unit 3 controls the intermediate relay K1 to disconnect the normally closed contacts K11 and K12 of the intermediate relay K1, so that the signal between the contacts of the gas density relay 1 and the monitoring loop of the density relay is disconnected, and the online calibration of the density relay 1 can be performed.

[0036] After the calibration, the signal acquisition and control unit 3 controls the intermediate relay K1 to close the normally closed contacts K11 and K12 of the intermediate relay K1, so that the signal connection between the contacts of the gas density relay 1 and the monitoring circuit of the density relay is enabled, and the density relay 1 can monitor the gas density of the electrical equipment 6, ensuring the reliable operation of the electrical equipment 6. That is, in the non-calibration state (normal working state of the gas density relay 1), the gas density relay 1 is used to monitor the gas density in the gas chamber of the electrical equipment 6. When the gas pressure in the gas chamber of the electrical equipment 6 reaches the alarm / latching value, the signal between the contacts of the density relay and the monitoring circuit is turned on, and an alarm or latching signal is sent to the background or secondary equipment through the monitoring circuit of the density relay.

[0037] Specifically, the pressure regulating mechanism 4 includes a housing 401, a pressure boosting device 404, and a blocking mechanism 405.

[0038] In this embodiment, the housing 401 constitutes a sealed cavity 409, the pressure boosting device 404 and the blocking mechanism 405 are located in the sealed cavity 409, and the sealed cavity 409 is arranged on the pipeline between the gas density relay 1 to be tested and the electrical equipment 6.

[0039] The gas inlet end of the pressure boosting device 404 is in communication with the sealed cavity 409, and the gas outlet end of the pressure boosting device 404 is in communication with the inner cavity of the blocking mechanism 405 through a connecting pipeline 4041. The pressure boosting device 404 can be one of, but not limited to, a pressure boosting pump, an air pump, etc.

[0040] Further, the connecting pipeline 4041 is sequentially provided with a flow control valve 4042 and a check valve 4043 in the direction from the pressure boosting device 404 to the blocking mechanism 405.

[0041] The blocking mechanism 405 is provided with an elastic sealing element 405A and an exhaust mechanism 406. One end of the blocking mechanism 405 is fixed to the housing 401, and the other end selectively closes or opens the connecting pipeline between the sealed cavity 409 and the electrical equipment 6 through the elastic sealing element 405A. The driving force of the elastic sealing element 405A for closing the corresponding connecting pipeline is provided by the high-pressure gas input by the pressure boosting device 404.

[0042] Further, the pressure regulating mechanism 4 further includes an elastic element 408. The elastic element 408 enables the elastic sealing element 405A to have a tendency to open the connecting pipeline between the sealed cavity 409 and the electrical equipment 6. That is, the elastic force provided by the elastic element 408 enables the elastic sealing element 405A to no longer complete the closing of the corresponding connecting pipeline.

[0043] Preferably, the sealing mechanism 405 is further provided with a sensor 407. The sealing mechanism 405 is a corrugated spring mechanism.

[0044] Preferably, the signal acquisition and intelligent control unit 3 is in communication with the sealed cavity 409, for realizing the acquisition of the gas pressure and temperature data in the sealed cavity 409, and completing the control of the various functional components in the pressure regulating mechanism 4. The signal acquisition and intelligent control unit 3 is connected with the gas density relay 1 to be tested, for completing the acquisition of the contact state data in the gas density relay 1.

[0045] When the gas density relay 1 is online checked, the sealing mechanism 405 in the pressure regulating mechanism 4 closes the connecting pipeline between the sealed cavity 409 and the electrical equipment 6. That is, the gas circuit between the gas density relay 1 and the electrical equipment 6 is cut off, and the gas circuit inside the pressure regulating mechanism 4 and the gas density relay 1 forms a sealed gas chamber. The pressure regulating mechanism 4 can easily adjust the pressure of the sealed gas chamber, and will not cause any impact on the gas pressure in the electrical equipment 6 during the pressure regulating process of the pressure regulating mechanism 4. Also, there will be no gas leakage to the outside. During the checking of the gas density relay 1, the electrical equipment 6 does not need to be powered off and can work normally.

[0046] Embodiment 2

[0047] Reference Figure 1 and Figure 2 On the basis of embodiment 1, the detection device of the present application further comprises a multi-way joint 5.

[0048] In this embodiment, the shell 401 is fixed to the side wall of the multi-way joint 5 through the fixing member 403, and the shell 401 and the side wall of the multi-way joint 5 are provided with a sealing element 402. Thus, the sealed cavity 409 is formed by the shell 401 and the multi-way joint 5.

[0049] Among them, the gas density relay 1 and the signal acquisition and intelligent control unit 3 are respectively in communication with the sealed cavity 409 through the pipeline in the multi-way joint 5. The electrical equipment 6 is in communication with the sealed cavity 409 through the pipeline in the multi-way joint 5.

[0050] Embodiment 3

[0051] Reference Figure 3 , 4 , 5, 6, on the basis of embodiment 1 or embodiment 2, the present application further discloses an online checking method of a gas density relay.

[0052] The working principle of online checking is as follows: the checking of the running gas density relay 1 is operated as follows:

[0053] Firstly, the signal acquisition intelligent control unit 3 collects the pressure and temperature values of the gas chamber of the electrical equipment 6 in real time, and obtains the conclusion of the allowable check by comparing and analyzing with the preset threshold value of the corresponding allowable check. Under the premise of the allowable check, the contact triggered in the check process needs to avoid sending false alarm signals to the background. Therefore, the signal acquisition intelligent control unit 3 needs to cut off the signal connection between the gas density relay 1 and the background system before formally checking the gas density relay 1, and keep the signal state of the background system consistent with the signal state before the check. Specifically, from Figure 2 It can be known that in the embodiment, the signal acquisition intelligent control unit 3 sends an instruction to control the signal on-off between the contact of the gas density relay 1 and the monitoring loop of the density relay through the intermediate relay K1. That is, when the gas density relay 1 is allowed to be checked online, the signal acquisition intelligent control unit 3 controls the intermediate relay K1 to disconnect the normally closed contacts K11 and K12 of the intermediate relay K1. In this way, the signal between the contact of the gas density relay 1 and the monitoring loop of the density relay is disconnected, and the online check of the density relay 1 can be performed.

[0054] Then, the signal acquisition intelligent control unit 3 instructs the exhaust mechanism 406 to close the valve, the booster device 404 drives the gas from the sealed cavity 409 to the flow control valve 4042 (or controller) through the connecting pipe 4041, the flow control valve 4042 (or controller) performs flow control or adjustment processing, and then enters the sealing mechanism 405 cavity through the check valve 4043 (the check valve 4043 has the function of preventing backflow of gas pressure), so that the sealing mechanism 405 (corrugated spring mechanism) expands and moves, drives the sealing mechanism 405 to move and compresses the elastic element 408, the gas pressure in the sealing mechanism 405 cavity continuously increases, so that the sealing mechanism 405 expands and moves to the interface of the corresponding connecting pipeline of the electrical equipment 6, the elastic sealing element 405A on the sealing mechanism 405 forms a sealing surface with the interface of the corresponding connecting pipeline of the electrical equipment 6, that is, the sealing mechanism 405 shuts off the gas communication between the gas density relay 1 and the electrical equipment 6. At this moment, the gas density relay 1, the pressure regulating mechanism 4 and the sensors in the signal acquisition intelligent control unit 3 are in the same sealed cavity.

[0055] Then, the booster 404 continues to drive the sealed cavity 409 gas to the compression chamber of the sealing mechanism 405, so that the pressure in the sealed cavity 409 slowly drops. Assuming that the gas density relay 1 is three contacts, the pressure drop in the chamber will trigger the action of the three contacts. During the entire pressure drop process (i.e., the downstroke verification), the signal acquisition and control unit 3 automatically acquires, records, and saves the corresponding pressure and temperature values in the chamber when the contacts are triggered (including the contact being connected or disconnected). The signal acquisition and control unit 3 processes the temperature and pressure values at the time of contact triggering through a preset algorithm and records or / and saves them, which are the action verification values (downstroke) of the contacts of the gas density relay 1.

[0056] After the signal acquisition and control unit 3 acquires the required contact triggering state information, or after the signal acquisition and control unit 3 meets the set value of the sensor 407, the signal acquisition and control unit 3 sends a corresponding instruction to stop the booster 404 from working (i.e., completes the downstroke verification).

[0057] Then, the signal acquisition and control unit 3 processes and sends an instruction to control the exhaust mechanism 406 to start working. The exhaust mechanism 406 opens the valve, and the valve of the exhaust mechanism 406 can be one of a flow controller, a pulse valve, an electromagnetic valve, an electric valve, and a pressure reduction orifice.

[0058] After the valve of the exhaust mechanism 406 is opened, the gas in the chamber of the sealing mechanism 405 flows to the sealed cavity 409, causing the pressure in the sealed cavity 409 to rise. The pressure in the sealed cavity 409 is communicated to the gas density relay 1, causing the gas density relay 1 to rise with the rising pressure in the sealed cavity 409. Then, the gas density relay 1 generates contact action (reverse stroke action value). During the entire pressure rise process, the signal acquisition and control unit 3 automatically acquires, records, and saves the pressure and temperature values in the chamber when the contacts are triggered (including the contact being connected or disconnected). The signal acquisition and control unit 3 processes and records the temperature and pressure values at the time of contact triggering through a preset algorithm, which are the reset reverse stroke (upstroke) verification values of the contacts of the gas density relay 1.

[0059] Then, the signal acquisition and control unit 3 analyzes, processes, and judges whether the verified gas density relay 1 is qualified, and can send the verification conclusion to the background system for the maintenance personnel to check and whether to maintain and process the density relay.

[0060] At the same time, the gas in the cavity of the blocking mechanism 405 continuously overflows out, and finally the gas pressure in the cavity of the blocking mechanism 405 and the gas pressure in the sealed cavity 409 reach balance, that is, they are communicated. Due to the effect of the elastic element 408 itself, the blocking mechanism 405 is automatically popped open, the elastic sealing element 405A on the blocking mechanism 405 is separated from the interface sealing surface of the corresponding connecting pipeline of the electrical equipment 6, the gas circuit of the electrical equipment 6 is communicated with the sensors in the gas density relay 1, the pressure regulating mechanism 4 and the signal acquisition and control unit 3, and after the verification is completed, the signal acquisition and control unit 3 automatically switches the secondary circuit signal back to the connection between the gas density relay 1 and the background signal, so that the gas density relay 1 restores to normal monitoring of the gas density in the gas chamber of the electrical equipment 6, so that the electrical equipment 6 can work safely and reliably.

[0061] Specifically, the signal acquisition and control unit 3 controls the intermediate relay K1, so that the normally closed contact points K11 and K12 of the intermediate relay K1 are closed, so that the signal connection between the contact points of the gas density relay 1 and the monitoring circuit of the density relay is realized, so that the density relay 1 can monitor the gas density of the electrical equipment 6, and ensure that the electrical equipment 6 can operate reliably, that is, in a non-verification state (when the gas density relay 1 is normally working), as shown in the figure, the gas density relay 1 is used to monitor the gas density in the gas chamber of the electrical equipment 6, and when the gas pressure in the gas chamber of the electrical equipment 6 reaches the alarm / latching value, the signal conduction between the contact points and the monitoring circuit of the density relay will be triggered, and an alarm or latching signal will be sent to the background or secondary equipment through the monitoring circuit of the density relay. Figure 2

[0062] Through the structural design of the monitoring device, the body of the gas density relay 1 is turned off in a sealed cavity during the entire verification process, the gas pressure rises and falls, and SF6 gas leakage to the atmospheric environment does not occur, so that the density relay is realized for on-line verification and field operation without leakage.

[0063] It should be noted that the electrical equipment in the embodiment of the present application can be a switch device, such as a GIS device (GAS insulated SWITCHGEAR, gas insulated metal enclosed switchgear), and of course, the gas density monitoring device can also be used for other electrical equipment that needs to monitor the gas density inside, which will not be described here.

[0064] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.​

Claims

1. A gas density relay monitoring device, characterized in that, The monitoring device includes a signal acquisition and control unit (3) and a pressure regulation mechanism (4). The pressure regulating mechanism (4) includes a housing (401), a pressurizing device (404), and a sealing mechanism (405). The housing (401) forms a sealed cavity (409), the pressurizing device (404) and the sealing mechanism (405) are located inside the sealed cavity (409), and the sealed cavity (409) is arranged on the pipeline between the gas density relay (1) to be measured and the electrical equipment (6); The air inlet of the booster device (404) is connected to the sealed cavity (409), and the air outlet of the booster device (404) is connected to the inner cavity of the sealing mechanism (405) via the connecting pipe (4041). The sealing mechanism (405) is provided with an elastic sealing element (405A) and an exhaust mechanism (406). One end of the sealing mechanism (405) is fixed to the housing (401), and the other end is connected to the electrical equipment (6) by means of the elastic sealing element (405A) to either close or open the connection pipeline between the sealing cavity (409) and the electrical equipment (6). The signal acquisition intelligent control unit (3) is connected to the sealed cavity (409) to realize the acquisition of gas pressure and temperature data in the sealed cavity (409) and to complete the control of each functional component in the pressure regulating mechanism (4); and the signal acquisition intelligent control unit (3) is connected to the gas density relay (1) to complete the acquisition of the contact status data in the gas density relay (1); The pressure regulating mechanism (4) further includes an elastic element (408) that causes the elastic sealing element (405A) to tend to open the connection between the sealing cavity (409) and the electrical equipment (6); The signal acquisition and control unit (3) is equipped with a pressure sensor and a temperature sensor.

2. The monitoring device as described in claim 1, characterized in that, The connecting pipeline (4041) is provided with a flow control valve (4042) and a check valve (4043) in sequence from the pressurizing device (404) to the sealing mechanism (405).

3. The monitoring device as described in claim 1, characterized in that, The blocking mechanism (405) is also equipped with a sensor (407).

4. The monitoring device as described in claim 1, characterized in that, The sealing mechanism (405) is a corrugated spring mechanism.

5. The monitoring device as described in claim 1, characterized in that, The monitoring device also includes a multi-port connector (5), and the gas density relay (1) and the signal acquisition intelligent control unit (3) are connected to the sealed cavity (409) through the internal pipeline of the multi-port connector (5).

6. The monitoring device as described in claim 5, characterized in that, The electrical equipment (6) is connected to the sealed cavity (409) via the internal pipeline of the multi-port connector (5).

7. The monitoring device as described in claim 6, characterized in that, The housing (401) is fixed to the side wall of the multi-port connector (5) by a fastener (403), and a sealing element (402) is provided between the housing (401) and the side wall of the multi-port connector (5).

8. The monitoring device as described in claim 1, characterized in that, The signal acquisition and control unit (3) is connected to the gas density relay (1) via the signal line (2).

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